Catalonia's Mossos d'Esquadra police are taking a census of every Muslim woman wearing a niqab or burqa.
Whenever they see a woman wearing a full-body veil which also covers their faces, by taking down their details and passing it on to the local authorities.
"Catalan police have always been convinced that niqab-bearing women can be indicative of a radical or Salafist branch of Islam," Spain's Interior ministry explained.
On July 18th, the Catalan Parliament approved a motion which bans people from covering their faces if deemed a security risk.
Several political parties in the region are now pushing for the law to apply to Muslim head gear, which would prohibit its usage in public spaces across Catalonia.
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Salafism as a more rigorous Islamic movement associated with Sunni Muslims which defend the traditional values of the Koran.
Although the exact number of Muslims and veil-bearing women in Catalonia is not known, figures from the Islamic Andalusí Observatory state there are 427,000 people who practise Islam in the region.